The "Boogens" are scaly monsters that look somewhat like giant turtles with lots of sharp, nasty teeth. They are released from an abandoned, boarded-up silver mine in Colorado and proceed to do away with character after character

Afraid of not knowing... Afraid to find out... After a 100 years someone has reawakened "The Boogens"

After a 100 years they have reawakened

Movie Trivia:

Some believe that "The Boogens" is an actual term once used by miners to describe the fear some would experience while spending too much time in deep mines. In fact, it was a word fabricated by screenwriter David O'Malley, using the word "boogeyman" as it's root.